The Top of the 4LV Range: 250 mhp from 2.8 Litres
The YANMAR 4LV250 is a 2.755 L, four-cylinder marine diesel rated at 184 kW / 250 mhp at 3800 rpm, the top of the 4LV series, which covers 150 to 250 mhp on a single compact block. Designed for sailing yachts over 50 ft, super yacht tenders, small motor boats and light-duty commercial vessels, it suits new builds and repowers alike. YANMAR built the series around five things: clean, interconnective, quiet, powerful and fuel efficient.
Powerful and fuel efficient. Denso common-rail direct injection with turbocharging and intercooling delivers powerful low-end torque and superior acceleration from the 2.8 L displacement, with fuel consumption optimized for longer journeys.
Clean and quiet. The 4LV250 exceeds EPA Tier 3 and EU RCD Stage 2 emissions regulations and measures exceptionally low for smoke, odor and noise, with the low vibration the series is engineered for.
Interconnective. Direct plug-and-play connectivity to NMEA and J1939 CAN networks gives smooth integration with any multi-function bridge display. YANMAR’s VC10 and VC20 vessel control systems and the JC10 (sterndrive) or JC20 (shaft drive) joystick systems are available as options. The engine is offered for shaft drive with Kanzaki KMH50A or KMH50V gears, with the ZT370 sterndrive, or with a jet drive, and is SOLAS and USCG lifeboat approved.
- Powerful: 184 kW / 250 mhp at 3800 rpm, with powerful low-end torque and acceleration
- Fuel efficient: Denso common-rail injection optimized for fuel consumption on longer journeys
- Clean: exceeds EPA Tier 3 and EU RCD Stage 2, exceptionally low smoke and odor
- Quiet: engineered for minimal noise and low vibration
- Interconnective: plug-and-play integration with any multi-function bridge display via NMEA and J1939
- Shaft, sterndrive (ZT370) and jet drive configurations, 334 kg / 736 lb dry weight without gear
ZT370 sterndrive
YANMAR’s ZT370 sterndrive is matched to the 4LV and 8LV series for new installations and repowers, in single or twin configurations. A hydraulically actuated multi-disc clutch, precision-forged gears and counter-rotating propellers give smooth shifting, strong acceleration and straight tracking, and the large rudder area gives precise handling at low speed. An integrated electromagnetic shift version is available, and the ZT370 pairs with the VC20 vessel control system and the JC10 joystick.
| Specification |
Value |
| Type |
Sterndrive |
| Engine range |
150 to 370 mhp |
| Reduction ratios |
1.65, 1.78, 1.97, 2.18 |
| Clutch |
Hydraulically actuated multi-friction disc |
| Dry weight |
112 kg / 247 lb |
Shaft drive gears
For shaft-drive installations the 4LV250 is supplied with Kanzaki KMH50A (8 degree down angle; ratios 1.67, 2.13, 2.43) or KMH50V V-drive (12 degree; ratios 1.22, 1.58, 2.08, 2.47) gears. ZF gear options are also available; ask Mastry for the right match to your hull.
VC20 vessel control system
YANMAR’s second-generation vessel control system for all electronically managed YANMAR engines. A J1939-based CAN-bus system with dedicated engine networks, a standard emergency back-up panel and NMEA connections for other onboard systems. Controls every engine and transmission function and displays engine alarms and diagnostic codes.
JC10 joystick, sterndrive
Joystick control for twin 4LV and 8LV engines with ZT370 sterndrives, for new boats or retrofit. Boost and docking modes, electronic progressive steering, sideways and diagonal movement, 360 degree rotation, and optional second and third station kits.
JC20 joystick, shaft drive
Inboard joystick system for motorboats, powerboats and catamarans with twin YANMAR common-rail engines. Press the joystick in the direction you want to move; the JC20 engages the bow thruster and adjusts engine speed for precise maneuvering.
YD42 display
Compact full-color multi-function display in modern glass styling. Shows engine speed, load, oil pressure and coolant temperature alongside wind, speed, depth and AIS data, and reads YANMAR engine alarm and diagnostic codes.
YD25 panel
Compact switch panel with a 2.5 inch LCD showing all YANMAR engine data, alarms and diagnostic codes. Integrates with multifunction displays and glass helms, or serves as a standalone instrument on smaller vessels.
B25 and C35 panels
Start/stop tachometer panels for JH-CR and 4LV engines. The B25 carries a tachometer only; the C35 adds water temperature and oil pressure gauges. Both show engine hours, battery voltage, throttle position, engine load, fuel rate, intake air pressure and fuel temperature.
